HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Thailand

$412+ Cheap flights from Ontario (ONT) to Thailand

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/2. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BKK
Apr 22 — Apr 291
Tue 4/22
Tue 4/29
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Ontario to Thailand with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Ontario to Thailand

Keep the following information in mind while searching for Ontario to Thailand flight deals. Data was last updated April 17, 2025.

Round-trip from

$750
(Justfly.com)

One-way from

$412
(Trip.com)

Popular in

June

Cheapest in

March

Average price

$784
From Ontario to Thailand
Search Deals
One-way flight from Ontario to Thailand
Search Deals
Highest demand for flights based on searches. 18% potential increase in price ($222 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($38 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2025
Search Deals

Find flight deals from Ontario to Thailand

Cheapest flights from Ontario to Thailand
Explore the most affordable flight options available from Ontario to Thailand. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 17, 2025.

This Justfly.com deal was found by Cheapflights users on 4/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/275:45 amONT - BKK
2 stops26h 00mKorean Air
Sat 6/72:35 amBKK - ONT
2 stops28h 26mKorean Air
Deal found 4/16$750
This Delta deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/265:45 amONT - BKK
2 stops26h 00mDelta
Sat 5/109:40 pmBKK - ONT
2 stops34h 40mDelta
Deal found 4/17$767
This Korean Air deal was found by Cheapflights users on 4/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Korean Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/127:00 amONT - CNX
2 stops25h 05mKorean Air
Tue 2/1012:15 amCNX - ONT
2 stops32h 00mKorean Air
Deal found 4/16$781
This oojo deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/2212:10 amONT - BKK
1 stop26h 10mChina Airlines
Thu 10/302:05 pmBKK - ONT
1 stop17h 45mChina Airlines
Deal found 4/17$787
This United Airlines deal was found by Cheapflights users on 4/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/46:00 amONT - BKK
2 stops32h 35mUnited Airlines
Thu 9/189:35 amBKK - ONT
2 stops27h 18mUnited Airlines
Deal found 4/16$801
This Orbitz deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/66:00 amONT - BKK
2 stops34h 00mMultiple Airlines
Mon 10/131:55 pmBKK - ONT
2 stops42h 22mMultiple Airlines
Deal found 4/17$833
This Delta deal was found by Cheapflights users on 4/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/285:45 amONT - HKT
2 stops26h 25mDelta
Sat 5/1011:25 pmHKT - ONT
2 stops37h 10mDelta
Deal found 4/16$838
This oojo deal was found by Cheapflights users on 4/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/2112:10 amONT - CNX
1 stop20h 10mChina Airlines
Sun 9/2811:20 amCNX - ONT
1 stop20h 40mChina Airlines
Deal found 4/16$838
This Korean Air deal was found by Cheapflights users on 4/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Korean Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/37:00 amONT - HKT
2 stops23h 40mKorean Air
Wed 12/311:20 pmHKT - ONT
2 stops28h 58mKorean Air
Deal found 4/16$882
This KAYAK deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/611:10 pmONT - BKK
1 stop22h 50mSTARLUX Airlines
Mon 10/131:10 pmBKK - ONT
1 stop17h 55mSTARLUX Airlines
Deal found 4/17$902
This Korean Air deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Korean Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/117:00 amONT - HKT
2 stops23h 40mMultiple Airlines
Sun 11/1611:20 pmHKT - ONT
2 stops28h 58mMultiple Airlines
Deal found 4/17$931
This FlightHub deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/1210:45 pmONT - CNX
2 stops29h 10mMultiple Airlines
Wed 2/1111:25 amCNX - ONT
1 stop20h 25mMultiple Airlines
Deal found 4/17$958

Cheapflights Fare Finder

Customize your flight search to find flights from Ontario to Thailand that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated April 17, 2025.
Use the filters below to find and compare flights from Ontario to Thailand that are best for you.

Fly from

Ontario

Fly to

Thailand

Route

Depart

Return

Price

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sun 4/27

5:45 am-9:45 pm

2 stops26h 00m

Bangkok Suvarnabhumi

Sat 6/7

2:35 am-5:01 pm

2 stops28h 26m

$750

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Thu 9/18

6:00 am-9:45 pm

2 stops25h 45m

Bangkok Suvarnabhumi

Sun 10/19

11:30 pm-5:17 pm

2 stops31h 47m

$777

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Mon 9/22

12:10 am-4:20 pm

1 stop26h 10m

Bangkok Suvarnabhumi

Thu 10/30

2:05 pm-5:50 pm

1 stop17h 45m

$787

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Thu 9/4

6:00 am-4:35 am

2 stops32h 35m

Bangkok Suvarnabhumi

Thu 9/18

9:35 am-10:53 pm

2 stops27h 18m

$801

OntarioChiang Mai

ONT - CNX

ONTCNX

Ontario

Tue 8/19

7:00 am-9:55 pm

2 stops24h 55m

Chiang Mai

Wed 9/10

11:15 pm-5:17 pm

2 stops32h 02m

$820

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Mon 10/6

6:00 am-6:00 am

2 stops34h 00m

Bangkok Suvarnabhumi

Mon 10/13

1:55 pm-6:17 pm

2 stops42h 22m

$833

OntarioPhuket City

ONT - HKT

ONTHKT

Ontario

Mon 4/28

5:45 am-10:10 pm

2 stops26h 25m

Phuket City

Sat 5/10

11:25 pm-10:35 pm

2 stops37h 10m

$838

OntarioChiang Mai

ONT - CNX

ONTCNX

Ontario

Sun 9/21

12:10 am-10:20 am

1 stop20h 10m

Chiang Mai

Sun 9/28

11:20 am-6:00 pm

1 stop20h 40m

$838

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Mon 10/6

11:10 pm-12:00 pm

1 stop22h 50m

Bangkok Suvarnabhumi

Mon 10/13

1:10 pm-5:05 pm

1 stop17h 55m

$902

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Thu 10/9

11:30 am-7:20 am

2 stops29h 50m

Bangkok Suvarnabhumi

Sun 11/2

6:55 pm-6:17 pm

2 stops38h 22m

$960

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/17

Showing 1-10 of 43 results
1
2
3
...
5

Best time to book a flight from Ontario to Thailand

Have a flexible travel schedule? Discover the best time to fly to Thailand from Ontario with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Ontario to Thailand

What is the cheapest month to book a flight from Ontario to Thailand?

Currently, March is the cheapest month in which you can book a flight from Ontario to Thailand (average of $958). Flying from Ontario to Thailand in December is currently the most expensive (average of $1,574). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from ONT to TH?

Find hourly flight availability from Ontario to Thailand. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated April 17, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Ontario to Thailand as you normally would.

Rainfall in Thailand by month

Plan your trip to Thailand by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Thailand ranges from 0.4 - 12.6 inches per month. September is typically the wettest month, when rainfall can reach 12.6 in. January is typically the driest time to visit Thailand when rainfall is around 0.4 in.

Temperature in Thailand by month

Plan your trip to Thailand by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Thailand, use this chart to help with planning. For those seeking warmer temperatures, April is the ideal time of year to visit, when temperatures reach an average of 86.0 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 78.8 F).

Reviews of airlines servicing Thailand

Get insights into the airlines that provide service to Thailand. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Thailand. Reviews last updated April 17, 2025.
Peruse reviews from past customers who have flown with STARLUX Airlines, EVA Air and Korean Air from Ontario to Thailand to help guide your decision. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
STARLUX Airlines
9.1
Wonderful
154 reviews

Comfort

9.0

Boarding

9.0

Crew

9.3

Food

8.9

Entertainment

9.0

Overall

9.1

Reviews

1 / 5
10.0
Excellent

Andrew,Jan 2025

LAX - TPE

Crew were attentive from start to finish. Each meal was amazing. IFE screen was huge and had quite a bit of western movies, however the tv shows were lacking.
STARLUX Airlines
9.1
Wonderful
154 reviews
STARLUX Airlines
9.1
Wonderful
154 reviews

Comfort

9.0

Boarding

9.0

Crew

9.3

Food

8.9

Entertainment

9.0

Overall

9.1

Reviews

1 / 5
10.0
Excellent

Andrew,Jan 2025

LAX - TPE

Crew were attentive from start to finish. Each meal was amazing. IFE screen was huge and had quite a bit of western movies, however the tv shows were lacking.
EVA Air
8.4
Very good
1,177 reviews
STARLUX Airlines
9.1
Wonderful
154 reviews

Comfort

9.0

Boarding

9.0

Crew

9.3

Food

8.9

Entertainment

9.0

Overall

9.1

Reviews

1 / 5
10.0
Excellent

Andrew,Jan 2025

LAX - TPE

Crew were attentive from start to finish. Each meal was amazing. IFE screen was huge and had quite a bit of western movies, however the tv shows were lacking.
Korean Air
8.4
Very good
1,064 reviews
STARLUX Airlines
9.1
Wonderful
154 reviews

Comfort

9.0

Boarding

9.0

Crew

9.3

Food

8.9

Entertainment

9.0

Overall

9.1

Reviews

1 / 5
10.0
Excellent

Andrew,Jan 2025

LAX - TPE

Crew were attentive from start to finish. Each meal was amazing. IFE screen was huge and had quite a bit of western movies, however the tv shows were lacking.
Japan Airlines
8.3
Very good
1,443 reviews
STARLUX Airlines
9.1
Wonderful
154 reviews

Comfort

9.0

Boarding

9.0

Crew

9.3

Food

8.9

Entertainment

9.0

Overall

9.1

Reviews

1 / 5
10.0
Excellent

Andrew,Jan 2025

LAX - TPE

Crew were attentive from start to finish. Each meal was amazing. IFE screen was huge and had quite a bit of western movies, however the tv shows were lacking.
China Airlines
8.2
Very good
729 reviews
STARLUX Airlines
9.1
Wonderful
154 reviews

Comfort

9.0

Boarding

9.0

Crew

9.3

Food

8.9

Entertainment

9.0

Overall

9.1

Reviews

1 / 5
10.0
Excellent

Andrew,Jan 2025

LAX - TPE

Crew were attentive from start to finish. Each meal was amazing. IFE screen was huge and had quite a bit of western movies, however the tv shows were lacking.

Related info for your journey

Find useful and relevant information for your journey from Ontario to Thailand. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Ontario to Thailand?

    Ontario (ONT), located 3.1 mi from the city center, is the airport you fly out of when you book flights from Ontario to Thailand.

  • What are the cheapest airlines to fly from Ontario to Thailand one-way?

    One-way options have recently been found by users for as low as $418 on United Airlines. Other airlines that offer cheap prices include Korean Air from $448 and China Airlines from $451 one-way.

  • What are the most popular routes from Ontario to Thailand?

    Most travelers choose Ontario - Bangkok Suvarnabhumi, Ontario - Phuket City or Ontario - Chiang Mai when deciding on the best route from Ontario to Thailand.

  • Can I find deals for flights from Ontario to Thailand that include hotel bookings?

    Yes. In addition to deals on Ontario to Thailand flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Thailand?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Thailand.

  • Can I find deals for business class flights from Ontario to Thailand?

    Yes. Cheapflights offers flight deals from Ontario to Thailand by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Ontario to Thailand?

    Currently, March is the cheapest month in which you can book a flight from Ontario to Thailand (average of $958). Flying from Ontario to Thailand in December is currently the most expensive (average of $1,574). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Ontario to Thailand

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to Haneda flights
Los Angeles to Narita flights
San Francisco to Haneda flights
Los Angeles to Manila flights
San Francisco to Narita flights
San Francisco to Manila flights
Los Angeles to Incheon Intl flights
Los Angeles to Suvarnabhumi flights
Ontario to Narita flights
San Francisco to New Delhi flights
Los Angeles to Ho Chi Minh City flights
Ontario to Haneda flights
Los Angeles to Taiwan Taoyuan Intl flights
San Diego to Narita flights
San Francisco to Hongqiao Intl flights
San Francisco to Taiwan Taoyuan Intl flights
San Francisco to Hong Kong flights
Burbank to Narita flights
San Francisco to Suvarnabhumi flights
San Francisco to Mumbai flights
San Francisco to Incheon Intl flights
San Francisco to Pu Dong flights
Los Angeles to Hongqiao Intl flights
Los Angeles to Kansai Intl flights
Los Angeles to Pu Dong flights
Ontario to Manila flights
San Francisco to Ho Chi Minh City flights
Los Angeles to Gimpo Intl flights
Los Angeles to Hong Kong flights
San Francisco to Kansai Intl flights
Burbank to Manila flights
Santa Ana to Narita flights
San Diego to Haneda flights
Santa Ana to Manila flights
San Francisco to Singapore flights
Los Angeles to Singapore flights
San Francisco to Gimpo Intl flights
San Francisco to Capital flights
San Jose to Manila flights
Ontario to Suvarnabhumi flights
Los Angeles to Denpasar flights
San Jose to Haneda flights
San Francisco to Bangalore flights
Los Angeles to Sung Shan flights
Oakland to Narita flights
San Francisco to Hyderabad flights
Ontario to Ho Chi Minh City flights
Burbank to Suvarnabhumi flights
Santa Ana to Suvarnabhumi flights
San Jose to Narita flights

Top 4 airlines flying from Ontario to Thailand

Discover the top 4 airlines that operate flights from Ontario to Thailand. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated April 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
Korean AirCheapest$785Average$826FlexibilityNo cancel feeOn-time81%
United AirlinesCheapest$795Average$1,035FlexibilityNo cancel feeOn-time69%
DeltaCheapest$807Average$809FlexibilityNo cancel feeOn-timeN/A
China AirlinesCheapest$825Average$915FlexibilityNo cancel feeOn-time70%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.